I have an ART tube preamp and I am using the XLR input for my Shure SM57.

How do I connect the preamp to an Audiophile 2496?

Also I was considering the Audiophile 192 but I don't really need the extra inputs, will it produce much better quality?

I am currently using the Line in of my Audigy card as my interface using an XLR to 1/8" cable.